TDA8950 NXP Semiconductors, TDA8950 Datasheet - Page 19

• Manufacturer Part Number: TDA8950
• Description: The TDA8950 is a high-efficiency Class D audio power amplifier
• Manufacturer: NXP Semiconductors

NXP Semiconductors
TDA8950_2
Product data sheet
13.5 Heatsink requirements
An external heatsink must be connected to the TDA8950.
Equation 5
of TFB and total thermal resistance from junction to ambient.
Power dissipation (P) is determined by the efficiency of the TDA8950. Efficiency
measured as a function of output power is given in
derived as a function of output power as shown in
R
Fig 9.
th j a –
(1) R
(2) R
(3) R
(4) R
(5) R
=
Derating curves for power dissipation as a function of maximum ambient
temperature
T
----------------------- -
th(j-a)
th(j-a)
th(j-a)
th(j-a)
th(j-a)
defines the relationship between maximum power dissipation before activation
j
–
P
= 5 K/W.
= 10 K/W.
= 15 K/W.
= 20 K/W.
= 35 K/W.
T
amb
(W)
P
Rev. 02 — 11 June 2009
30
20
10
0
0
20
(1)
(2)
(3)
(4)
(5)
40
60
Figure
Figure
2
80
T
amb
150 W class-D power amplifier
19.
20. Power dissipation can be
mbl469
( C)
100
TDA8950
© NXP B.V. 2009. All rights reserved.
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